mixin head
  doctype html
  html
    head
      - if(attributes.title)
        title=attributes.title
      - else
        title 我是标题
      meta(charset="UTF-8")
      meta(name="viewport" content="width=device-width, initial-scale=1, maximum-scale=1, user-scalable=no")
      link(rel="stylesheet", href="bootstrap/css/bootstrap.min.css")
      script(src="jquery/jquery.min.js")
      script(src="bootstrap/js/bootstrap.min.js")
      if block
        block